Jurnal Pendidikan Kimia (JPKim) ISSN: 2085-3653 (Print) | 2549-3116 (Online) DOI Prefix: 10.24114 (CrossRef Member since 2016) Jurnal Pendidikan Kimia (JPKim) is a peer-reviewed open-access journal that publishes high-quality research articles, reviews, and short communications in the fields of Chemistry Education and Chemistry. Established in 2009, the journal is published three times annually (April, August, and December) by the Postgraduate Program of Universitas Negeri Medan, Indonesia. Jurnal Pendidikan Kimia (JPKim) is committed to promoting scholarly research and innovation in chemical education and its applications in teaching and learning. The journal aims to provide a platform for academics, researchers, and practitioners to disseminate theoretical and empirical findings that contribute to the advancement of the discipline. Since December 2016 (Vol. 8 No. 3), all published articles have been assigned a Digital Object Identifier (DOI) through CrossRef. To uphold academic integrity, the journal implements a strict plagiarism screening policy using Turnitin, effective from Vol. 12 No. 3 (December 2020). Jurnal Pendidikan Kimia (JPKim) has been accredited as a nationally recognized scientific journal by the Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia, under Decree No. 204/E/KPT/2022, dated October 3, 2022. This accreditation, at the level of SINTA 2, is valid for five years, from Vol. 14 No. 1 (April 2022) through Vol. 18 No. 2 (August 2026). The journal is indexed in several national and international databases and strives toward broader visibility and global readership.
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The development of enrichment book of chemistry in our body based on augmented reality and its influence on chemistry literacy and scientific attitude of high school student
This research aims of this research is to obtain produce enrichment book of chemistry in our body based on augmented reality which can display the 3D shape of molecular shape and chemical bonds developed from macromolecular materials that are suitable for increasing student chemical literacy and scientific attitude. This development research uses a 4D model developed by Thiagarajan which consists of stages Define, Design, Development, and Disseminate. The trial was carried out on 1 limited test class and 2 wide test classes (1 experimental class and 1 control class) of XII Science students at Senior High School of Angkasa Adisutjipto. The results of the research show that: 1) Enrichment book of chemistry in our body based on augmented reality that have been developed have very decent quality by media and materials validators; 2) the practicality response are included in the "Very Good" category with the average score of the percentage of ideals obtained of 88.62%; 3) the students response are included in the "Very Good" category with the average score of the percentage of ideals obtained in the limited trial of 81.21% and extensive trial of 84.39%; 4) the product are effective in increasing students chemical literacy and scientific attitude with the MANOVA test which obtained a significance value of 0.001; 5) the product are effective in improving students' chemical literacy with the MANOVA test which obtained a significance value of 0.006; 6) the product are effective in increasing students' scientific attitudes with the MANOVA test which obtained a significance value of 0.006.
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Scientific, inquiry, and animation integration: The IPSIA learning model in chemistry
This study addresses the issue of low active participation among students in chemistry learning, as well as their difficulties in understanding macroscopic, microscopic, and symbolic concepts, which contribute to unsatisfactory learning outcomes. To tackle these challenges and enhance students' performance in chemistry, a valid, practical, and effective IPSIA learning model was developed. The research employed a development approach based on the ADDIE (Analyze, Design, Develop, Implement, and Evaluate) model, beginning with a thorough analysis of the curriculum. This was followed by the design of the IPSIA model, which was validated using a questionnaire instrument. The results of the validity test scored 98, categorizing it as "very good." Additionally, the practical test of the IPSIA model also received a score of 98, indicating that it is user-friendly. During the implementation phase, the effectiveness of the model was assessed through test results. The improvement in students' chemistry learning was evidenced by normalized gain scores: 0.57 for the control class and 0.72 for the experimental class at Senior High School (SMA) 2 Padangsidimpuan, as well as 0.52 for the control class and 0.64 for the experimental class at SMA 5 Padangsidimpuan. These findings demonstrate that the IPSIA learning model is valid, practical, and effective in improving students' chemistry learning outcomes.
Oxidized cellulose 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) for Mn(II) adsorption
The presence of excess Mn²⁺ in water can result in unpleasant odors and tastes, and its consumption can lead to neurological disorders in humans. Adsorption using oxidized cellulose is an efficient method for removing Mn²⁺ ions. In this study, cellulose was oxidized using the TEMPO/NaOCl/NaBr system with varying NaOCl concentrations (5, 15, and 30 mmol/g) to identify the optimum conditions for Mn²⁺ adsorption. The carboxyl group content in the oxidized cellulose samples was 0.2393, 0.2435, and 0.2664 mmol/g, respectively. The adsorption efficiencies were 92.40%, 91.71%, and 91.43%, with the highest efficiency observed at 5 mmol/g NaOCl. The decrease in adsorption efficiency at higher NaOCl concentrations was attributed to the oxidation of secondary hydroxyl groups, forming undesirable ketone groups and disrupting the reaction pathway. FTIR analysis confirmed successful oxidation with a new absorption band at 1646 cm⁻¹. XRD analysis showed an increase in the crystalline index to 82.8%, 83.1%, and 83.13% for NaOCl concentrations of 5, 15, and 30 mmol/g, respectively. This study highlights the potential of TEMPO/NaOCl/NaBr-oxidized cellulose as an effective adsorbent for Mn²⁺ removal under optimized conditions.
Development of innovative electronic student worksheet (E-LKPD) based on somatic auditory visual intellectual (SAVI) on salt hydrolysis topic
A low understanding of salt hydrolysis and a lack of mastery of mathematics in the calculation section is a problem in learning chemistry. Therefore, this research aim is to produce a good electronic student worksheet (E-LKPD) based on SAVI learning model by determining the quality of LKPD in terms of (1) feasibility and (2) student response. This research and development (R&D) used a 4D development model that was modified to 3D. The research instruments used were interview and validation sheets, test items in the E-LKPD, and student response questionnaires. The research sample consisted of 10 students of class XI MIPA. The results showed that (1) the developed E-LKPD has good quality because it met valid criteria with a percentage of 90% in terms of material and 87% in terms of media. The average score of E-LKPD effectiveness is 78 (high criteria), and practically average score of E-LKPD based on students' response questionnaire is 94.4%; (2) students said that E-LKPD can help them learn and the material is exposed clearly (92.5%), can be used for independent study (97.5%), and the design of the E-LKPD is attractive (95%). Based on the research results, SAVI-based innovative E-LKPD can be used in chemistry learning on salt hydrolysis topics.
Development of electronic portfolios to assess concept mastery and creative thinking on project-based acid-based concepts
The purpose of the study was to develop an electronic portfolio instrument to assess concept mastery and creative thinking on project-based acid-base materials. The research participants are class XI, who will study acid-base materials. This research uses the 4D Research and Development model which are carried out up to stage 3 (Define, Design, and Development). On the define stage, a literature study, a field survey, material analysis, indicator analysis, and task analysis were conducted. The design stage designed grids and assessment rubrics, the preparation tasks consisting of four: making papers, practicum reports, posters, and concept maps. The design stage compiled an electronic portfolio instrument. The developmental stage conducts quality tests: initial development test, expert validity test obtained a CVR value of 1.00, reliability test with inter-rater obtained a Cronbach Alpha value between 0.652 and 1.000. After the electronic portfolio instrument was valid and reliable, a limited trial was conducted with N-Gain scores of task 1, task 2, task 3, and task 4, respectively: 0.17 (low), 0.13 (low), 0.46 (medium), and 0.32 (medium). The overall average of the pretest and posttest N-Gain scores is 0.90, with a higher category. This electronic portfolio instrument based on Project-Based Learning (PjBL) is expected to help teachers assess tasks on concept mastery and students' creative thinking on acid-based materials.
Implementation of green chemistry approaches in chemistry labs instruction: A systematic literature review
In recent years, the urgent need to address environmental problems has driven green chemistry in various disciplines, focusing on designing chemical products and processes that minimize hazardous materials. This research conducted a systematic literature review (SLR) to evaluate the application of green chemistry in higher education chemistry lab practices and its impact on students' conceptual understanding, practical skills, and environmental awareness. Using the PRISMA method, 46 articles were analyzed from the Scopus and ScienceDirect databases extracted from a total of 537 published between 2015 and 2024. The findings show that applying green chemistry in chemistry laboratory learning can improve students' conceptual understanding, practical skills, and environmental awareness while encouraging environmentally friendly synthesis methods. However, challenges such as limited resources and the need for additional training for lecturers still exist. Institutional support and professional development are needed to maximize implementation. In conclusion, green chemistry has great potential to create a more environmentally responsible generation of chemists, with recommendations for comprehensive integration into chemistry curricula and increased support for educators to address implementation challenges. This study provides a basis for expanding the application of green chemistry in chemistry education and preparing students to face future sustainability challenges.
The differentiated STEM approach in problem-based learning: Can it enhance students’ critical thinking skills in basic chemistry laws
The 21st century highlights the critical role of education in developing life skills, including critical thinking, to address rapid global changes. The learning process in schools becomes a critical factor in strengthening these skills. Therefore, this study aims to determine the effect of the Differentiated Problem-Based Learning (PBL) model with the STEM approach on students' critical thinking skills on basic chemical laws in class X of a Senior High School in Surakarta. Samples were selected using cluster random sampling to choose two classes as samples, namely, the experimental and control classes. Research data was collected through a post-test using an essay measuring students' critical thinking skills. The results were analyzed using the Kruskal-Wallis’s test based on the mean post-test scores of the experimental class (73.00) and the control class (64.4), yielding a significance value of 0.004 (< 0.05). These results indicate a positive effect of Differentiated PBL-STEM on students' critical thinking skills. Skilled group students consistently demonstrated critical thinking skills, while students in the intervention and intermediate groups showed improvements from the initial diagnostic results of the learning process.
AI-based assessment: Aiken index analysis of content validity in scientific literacy instruments on the basic laws of chemistry with ethnochemistry
Scientific Literacy Assessment (SLA) is used to measure science literacy on basic chemical law material that has been qualified and tested. This study aims to prove the content validity of ethnochemistry SLA instruments integrated with artificial intelligence (AI) systems using Aiken's validity index so that they can measure students' scientific literacy in basic chemical law material. The research design uses the ADDIE development model (Analysis, design, development, implementation and evaluation which is simplified into analysis, design, and development. Content validity data was obtained from 10 experts, namely 7 chemistry education lecturers from UNS, UNY, and UM and 3 chemistry teachers in Surakarta through focus group discussions (FGD). The content validation test is based on aspects of context, language, and construct. A valid instrument is indicated by an Aiken index value of more than or equal to 0.73. The AI-integrated ethnochemistry SLA instrument on basic laws of chemistry material produced 15 valid items with an Aiken index greater than 0.73.
Enhancing students’ scientific attitudes with a problem-based learning model integrated green chemistry
Enhancing scientific attitudes through education by incorporating green chemistry principles is essential, so that students can explore new ideas and information about chemistry concepts while considering environmental sustainability. This has the potential to change chemistry learning to be more meaningful. This study aims to determine the influence of the problem-based learning (PBL) model integrated with green chemistry on students' scientific attitudes. This research is a quasi experiment research with pretest-posttest control group design. The participants were XI MIPA class students who were randomly selected. The data collection method used scientific attitude questionnaire as an instrument. Data analysis includes n-gain test and hypothesis testing using t test. The results showed a sig value of 0.000 (0.000 < 0.05) and tcount of 5.136 (tcount > ttable). This indicates that there is a significant difference in scientific attitudes between students who follow the PBL-green chemistry learning model and students who follow learning with a scientific approach. The existence of this difference indicates that the PBL-green chemistry model has a positive influence in improving students' scientific attitudes.
Development and validation of an assessment for measuring chemical literacy in chemical equilibrium
Chemical literacy, the ability to integrate the understanding of chemistry with everyday life phenomena, has become a necessary skill for high school students. This skill is aimed at enabling students to develop an understanding of chemistry concepts about the environment, health, and industrial topics. This research focuses on developing and validating a chemical literacy assessment, specifically on chemical equilibrium. Afterward, the assessment was given the name Chemical Equilibrium Literacy Assessment. The development model is based on modified 4D and consists of two sets of 15 questions each. Content validity was measured using the Aiken V equation with seven expert judgments and four answer categories. To assess construct validity, the Pearson equation was used involving 100 respondents. The reliability of the assessment was calculated using Cronbach's Alpha. The results of content validity, construct validity, and quality of test items indicate that the chemical literacy assessment on chemical equilibrium material on environmental, health, and industrial topics has relatively high results. This assessment can be used to measure the chemical literacy abilities of high school students after studying chemical equilibrium.
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The development of a project-based multimedia and its effectiveness in improving students’ higher order thinking skills about chemistry bonding concept
This study aimed to develop a learning multimedia which is based on project-based learning (PjBL) and to investigate its effectiveness in improving students’ higher order thinking skills (HOTS) in the concept of chemistry bonding. This study used a research and development (R&D) design involving the method of Lee and Owen which consisted of five stages namely analysis, design, development, implementation, and evaluation (ADDIE) to develop the intended multimedia. The effect of the developed multimedia use on students’ HOTS was investigated using a one group pretest-posttest experimental design with a class of secondary high school students in Jambi city Indonesia. The research of analysis towards the development process showed that the project-based multimedia learning was successfully developed using the ADDIE method. This involved some validation results from some experts that include the chemistry expert and media learning expert who declared that it was valid and feasible to use. The results of experiments showed that the implemented multimedia was effective in increasing the participant students' HOTS after the learning process. The effectiveness was affirmed by the paired t-test (p-value = 0.000<0.05) indicating that there was a significant difference between the students’ HOTS pretest and posttest. This effectiveness was confirmed by the N-gain value of 0.58 which means that the students had experienced 58% HOTS improvement. This can thus be concluded that the developed project-based multimedia was valid and effective in improving students’ HOTS in the concept of chemistry bonding.
Enhancing critical thinking skill by implementing electronic student worksheets based on guided inquiry in natural science subject for elementary school
Students’ critical thinking skills currently fall short of the requirements for effective learning in the 21st century, highlighting a need for innovative educational models to help cultivate these skills. This study investigates the enhancement of critical thinking skills among sixth-grade elementary students by using an E-LKPD (electronic student worksheets) grounded in guided inquiry. The study utilized a pretest and posttest non-equivalent control group design, encompassing the full student cohort as the sample. Information regarding students' critical thinking abilities was obtained via a descriptive assessment that satisfied recognized validity and reliability standards. The study results, analyzed with an independent t-test on the N-gain score, show an overall improvement rate of 76.16%, exceeding the 70% threshold for high effectiveness. When analyzed by group, the control group achieved an N-gain of 68.11%, falling in the moderate category, while the experimental group reached an N-gain of 84.21%, showing a huge level of effectiveness. Those results conclude that the guided inquiry-based E-LKPD significantly increased critical thinking skills.
The potential of methanol extract nanoemulsion from gletang flower (Tridax procumbens) as an antibacterial agent against pathogenic bacteria
Gletang plant is a weed that grows wild and is widely distributed in various places such as rice fields, plantations, and roadsides. Phytochemical screening of gletang flower extract using methanol revealed the presence of secondary metabolites such as alkaloids, flavonoids, steroids, phenols, terpenoids, and tannins. This study aims to formulate a nanoemulsion from the methanol extract of gletang flowers. The extraction was performed by maceration with methanol 96%. The nanoemulsion was characterized by testing its pH, % transmittance, stability, viscosity and particle size using a particle size analyzer. The antibacterial activity was tested against Staphylococcus aureus and Escherichia coliusing the Kirby-Bauer method. The results of pH characterization, % transmittance, stability and viscosity tests met the standards. The particle size analyzer showed that the particle size ranged between 300-1000 nm. The antibacterial activity tests indicated that all three formulations showed activity against the pathogenic bacteria E. coli, with formulation 3 showing the highest activity.
The Acalypha siamensis leaf as natural dye in eco-print
The use of synthetic dyes in the textile industry has a negative impact on the environment. Therefore, it is necessary to explore natural dyes that are more environmentally friendly. The aim of this research is to find natural dyes from Acalypha siamensis leaves. In this research, compounds contained in A. siamensis extract were identified using FT-IR and GC-MS instruments, then simulations were carried out of the reactions that occurred between cinnamaldehyde (E), cellulose in cotton, and alum mordant using quantum chemistry software. ORCA 5.0.2 and Visual Molecular Dynamics (VMD). The cinnamaldehyde compound is the main constituent compound in A. siamensis leaf extract. Based on the simulation results: the reaction between cinnamaldehyde (E), cellulose in cotton fabric, and alum mordant is energetically favorable. The reaction simulation results are in line with experimental research, the reaction of cellulose in cotton fabric, alum mordant, and cinnamaldehyde produces a brownish green color. A. siamensis leaves have potential as a dye in eco-prints.
Pectin extraction from kepok banana peel waste (Musa acuminata balbisiana) based on green chemistry as a natural preservative
The aims of this research are (1) to extract pectin from kepok banana peels with an environmentally friendly solvent, namely tamarind and (2) to use pectin as a fruit and vegetable preservative. The research methods used were (1) extraction (2) Compound identification test using FTIR (3) Test the effectiveness of pectin's ability to preserve fruit and vegetables. The results of the research showed that the percent yield obtained was 26% and the results of compound identification showed that there were wavelengths corresponding to pectin compounds. The results of testing the effectiveness of pectin's ability to preserve the average result showed that pectin can increase the rotting time of fruit and vegetables. The conclusion from the results of this research is that tamarind can be used as a natural solvent in extracting pectin from kepok banana peels and pectin can be used as a natural preservative for fruit and vegetables.
Synthesis of (3E,5E)-1-benzil-3,5 bis (3 (benziloksi)benziliden)piperidin-4-on curcumin analogues and their potential as breast anticancer agents: Assessment using MTT test and molecular docking
Breast cancer is a serious disease that occurs in women and contributes to the highest mortality compared to other types of cancer. This study aims to synthesize curcumin analog compounds ((3E,5E)-1-benzyl-3,5 bis (3 (benzyloxy)benzylidene) piperidin-4-one), test them in vitro against various breast cancer cells (T47D, HER-2, MCF-7, and 4T1) and normal cells (vero cells), and study their molecular docking. Synthesis was carried out by reacting 3-benzyloxybenzaldehyde with N-benzyl-4-piperidone catalyzed by 5% KOH at room temperature; in vitro testing was carried out using the Microculture Tetrazolium Technique Assay method, ADMET analysis with an online database server, and molecular docking studies in Autodoc Vina. The synthesis results obtained yellow solid powder with a yield of 65.85%, characterization with TLC gave black fluorescence (Rf 0.63), melting point 114-116oC, TLC scanner one peak (100%), retention time 0.65 minutes, 1H &13C-NMR analysis showed the molecular formula C40H35NO3, moderate activity against 4T1 breast cancer cells and inactivity on T47D, HER-2, and MCF-7 cancer cells, and did not show cytotoxicity to normal cells (vero cells). ADMET predictions from Lipinski's five rules contained two parameters that did not meet, namely molecular weight and log P value. Molecular docking studies were carried out on estrogen receptor protein (ER)-α (PDB ID: 2ERT), which showed a binding affinity energy of -8.7 kcal/mol and -7.1 kcal/mol of the native ligand. Further research and development is needed on synthetic curcumin analog compounds to increase their activity value against breast cancer by paying attention to Lipinski's five rules to obtain compounds with better potential activity and ADMET.
Synthesis and characteristics rubber seed oil bioadditive from Sumatera Utara as low pour point of CPO biodiesel
One of the drawbacks of Crude Palm Oil (CPO) biodiesel is that it has high pour point which causes disadvantages in it™s use. North Sumatra is the second largest rubber producer in Indonesia, the use of rubber seeds as a bioadditive to reduce the pour point of CPO biodiesel is one of the right steps. The synthesis of rubber seed oil bioadditives is carried out in two processes; esterification process and transesterification process. This research aims to reduce the pour point of CPO biodiesel by mixing it with bioadditive of rubber seed oil. This study evaluated the effect of composition to find the best combination of biodiesel ratios in the mixture. The research results show that the greater the proportion of bioadditive rubber seed oil, the lower the pour point of the mixed biodiesel. Biodiesel with a low pour point is obtained at 10oC from mixing CPO biodiesel with bioadditive rubber seed oil at a composition of 75:25 and the optimal pour point is -7oC. Performance testing is carried out to differentiate fuel properties and fuel performance. The results show that B15 fuel produces the best performance at a maximum engine speed of 3000 rpm. In this round, a maximum power of 1.5708 kW was obtained, the lowest specific fuel consumption was 517.52 gr/kWh, thermal efficiency was 18.77%; the smallest CO content was 2.808%; HC 185 rpm; CO2 5.28%; NOx 4 ppm.
Copyright (c) 2024 Misdawati Misdawati, Siswadi Siswadi, Muhammad Said Siregar https://creativecommons.org/licenses/by/4.0
Bibliometric analysis : Green chemistry trends and issues in chemistry education from 2019 to 2024
This study analyzes green chemistry research trends in chemistry education. This study used a quantitative bibliometric approach. The number of publications analyzed is 104 publication documents from 2019 “ 2024. This research collects, processes, and filters information in Scopus journals and articles. Metadata results show that the distribution of publication frequency peaked in 2019, with 26 documents identified. The green chemistry research area is dominated by chemistry research (31.3%). The country with the most documents and the most productive in publishing green chemistry is the United States, with 30 papers identified. At the same time, Indonesia is ranked fifth as the most productive country in publishing green chemistry, with 10 documents identified. Canada ranked second with 17 papers, and Germany ranked third with 15 documents. The institutions that contributed the most came from Germany: the University of Bremen, with 11 papers 10.58%, and the University of Toronto with 8 documents (7.69%). The authors with the most citations are Chen Tse-Lun et al., with 245 citations. Meanwhile, when viewed from the number of documents published by the author, Eilks I. has 11 papers with a contribution of 4.91%. There are 5 clusters with the most popping keywords: green chemistry, human, and chemical reaction. Research and publications on this topic have been sparse in the past five years. Surveys and analyses of green chemistry literature are essential because tracking research trends in green chemistry in chemistry education is vital to directing the future.
Copyright (c) 2024 Wanda Setya Hanifa https://creativecommons.org/licenses/by/4.0
Developing a weblog-based additive and addictive substance teaching module to improve critical thinking skills
This study aims to develop and obtain a webb-based teaching module on the material of additives and addictive substances. Also to determine the feasibility of the module, improvement think critical students, knowing which is better, learning using developed modules or existing books and to find out students' responses after being taught with the module substance additives and addictive based webb developed. The research method with R&D using the ADDIE model. The Webb-based teaching module was validated by 7 validators, then the valid module was presented to 20 students as a limited trial. The subjects of this study were 2 classes of class VIII students of Junior High School 8 Binjai, each class consisting of 28 students. The test instrument consisted of 15 critical thinking questions and non-test instruments in the form of BSNP questionnaires and student response questionnaires. The results of the study showed that the webb-based learning module on the material of Additive and Addictive Substances developed was categorized as Valid at a validity of 3.4 or an average percentage of 85%. While the results of the n-gain test were 82% in the experimental class with a high category and 73% in the control class with high category. t- test results shows that critical thinking skills student which using module teach based on webb which has developed more higher than the critical thinking skills of students who are taught using books package which exists at school. Results of student response questionnaire analysis show that student give response positive as big as 86%. Thus, the webb-based teaching module developed is ready to be used in learning the material on additives and addictive substances in food in order to improve students' critical thinking skills.
Copyright (c) 2024 Ade Nur Anugrah https://creativecommons.org/licenses/by/4.0
The effect of comonomer styrene on the grafting of maleic anhydride onto cyclized natural rubber
The grafting degree of maleic anhydride onto cyclized natural rubber is generally still low. This is due to the lack of electron density of the maleic anhydride double bond so that its reactivity is low. This research aims to increase the grafting degree by the addition of a styrene comonomer. Grafting of maleic anhydride onto cyclized natural rubber had been performed in an internal mixer 150 oC and 80 rpm in the presence of styrene comonomer. The grafted product was analyzed by Fourier Transform Infra-Red to determine the presence of maleic groups and Differential Scanning Calorimetry and Thermalgravimetric to investigate its thermal properties. Fourier Transform Infra-Red spectra confirmed that the grafted product of maleic anhydride onto Cyclized Natural Rubber formed with absorption at 1700 cm-1, 1850 cm-1 and 700 cm-1. The higher concentration of maleic anhydride reacted the higher of grafting degree of maleic anhydride with the high intensity of absorption at 1700 cm-1 and 1850 cm-1. Differential Scanning Calorimetry spectra showed that the glass transition temperature of maleated Cyclized Natural Rubber products increases, the more comonomer are added the higher the glass transition temperature of the product. Generally, based on the Thermalgravimetric spectra, the thermal properties of grafted product does not change significantly compared to the blank sample.
Copyright (c) 2024 Muhammad Said siregar https://creativecommons.org/licenses/by/4.0
Detecting the interest of undergraduate students : A new way of chemistry education as a basis for instructional development
The achievement of learning targets is largely determined by how learning facilitates the needs of participants. Interest is one of the important points that teachers need to be aware of, especially in higher education environments to produce competent and resilient students (prospective teachers). The purpose of the research was to detect the interests of chemistry education students quantitatively and other themes that related to their lives. The quantitative approach was the method used in the study because it was in line with the data collection technique, namely the questionnaire technique with quantitative analysis. The results showed that the theme interest œeveryday life with the topic of food has the largest percentage, namely 86%, while the least theme was textile dyeing (58.30%) by chemical processes theme. Other additional themes revealed that social media (digital technologies) has 75.50% while teaching & learning and diversity have percentages of 64.70% and 59%, respectively. The conclusion was that detecting elements of interest in students could be supporting data for designing chemistry learning considering the changes in the mindset of the young generation due to digital culture. This research can also be used as a needs analysis in learning because a great interest in learning affects students™ academic performance. Research findings also give be a provision for students when they become teachers so that this research can be used in the school environment.
Novice teachers Structure and mental model
Copyright (c) 2024 Restu Prayogi, Parham Saadi, Almubarak Almubarak, Fadhlan Muchlas Abrori https://creativecommons.org/licenses/by/4.0
The quality of indonesian brands of consumable cooking oils is reviewed by peroxide numbers and free fatty acid value
This study evaluated laboratory skills among the students during biochemistry practicum activities and built laboratory information for the internal and external community of Universitas Negeri Surabaya in 2024. The habit of reusing cooking oil for the main reason of saving costs can cause health problems. Parameters used to determine quality cooking oils include content-free fatty acids and number peroxide. The research purposes for this experiment are to know the rate of free fatty acids and the number of peroxides in Branded and out-of-stock cooking oil used for now. Determination of free fatty acids was done with the method of alkalimetry and the determination number of peroxide was done with the technique of iodometry. Result of the study This shows average rate of sour fat-free oil frying before frying is 0.22% And after frying becomes 0.40% or enhancement amounting to 185.98 %. The average level of number peroxide oil fried before frying is as big as 1.11 meq O2 /kg and after frying to 3.52 meq O2 /kg or enhancement as big as 317.25%. Average rate sour fat-free oil fry before frying No exceed standard SNI 7702: 2012, namely maximum 0.3%. However, the average level of free fatty acids in cooking oil after frying exceeds the SNI 7702:2012 standard, namely above 0.3%. Whereas the average rate number peroxide oil fry before and after frying does not exceed standard SNI 7709: 2012 which is a maximum of 10 meq O2 /kg.
Copyright (c) 2024 Mirwa Adiprahara Anggarani https://creativecommons.org/licenses/by/4.0
Improving students' scientific literacy : Development of guided inquiry-based student worksheets on buffer solution material
Everyone must have scientific literacy to actively participate in advancing science, technology, and society. However, the scientific literacy skills of Indonesian students are still low. This research aims to develop student worksheets based on guided inquiry on buffer solution material to increase students' scientific literacy. This research applied 4D development research which includes the Definition, Design, Development, and Dissemination stages. At the definition stage, a needs analysis was carried out, while at the design stage, a draft of the student worksheet was made. At the development stage, the worksheet was validated by 5 validators. Furthermore, the revised worksheet was tested for readability by 10 students in class XI IPA. Finally, the revised worksheet was field tested on 32 students through a learning buffer solution in class with a guided inquiry strategy. This study employed a descriptive approach to assess the validity, practicality, and effectiveness of the worksheet. The findings indicate that the developed worksheet is highly valid, with an average validity score of 94.11% across the content, presentation, media, and language aspects, placing it in the very valid category. The worksheet also achieved a practicality score of 84%, indicating it is practical. Additionally, the worksheet improved students' scientific literacy with an N-gain value of 0.59. Therefore, it can be concluded that the worksheet can be used to improve students' scientific literacy through buffer solution learning.
Copyright (c) 2024 Dr. Arif Sholahuddin, M.Si Arif Sholahuddin Arif Sholahuddin, Normina Mina Mina, Dra. Hj. Rilia Iriani, M. Si Rilia Iriani Rilia Iriani https://creativecommons.org/licenses/by/4.0
Development of chemino card learning media (chemical domino cards) on elemental stability material
This reserach is research and development which aims to determine the level of validity, practicality and effectiviness of Chemino Card learning media as a learning media on elemental stability material which was carried out at X IPA. This development refers to the ADDIE development model which consists of five stages, namely: (1) analysis stage, (2) design state, (3) development stage, (4) implementation stage and (5) evaluation stage. The validity instrument is in the form of a validation sheet for media experts and material experts. Practical instrument include learning implementation observation sheets, teacher response questionnaires, student response questionnaires. The effectiviness instrument is a learning outcomes test. Research results show that: (1) the validity of the Chemino Card media based on material experts and media experts, respectively 3.33 and 3.46 which are included in the very valid category, (2) the practicatily of the Chemino Card media based on the observation of learning implementation, response questinnaire teachers and student respectively 96.67%, 90.03% and 83.42% which are included in the very high category, (3) effectiveness of Chemino Card media based on student learning outcomes that achieve class mastery of 92% that it is included in the effective category. Based in these data, it was concluded that Chemino Card learning media on elemental stanility material developed using the ADDIE model were stated to be valid, practical and effective for us in learning.
Copyright (c) 2024 Suhardi https://creativecommons.org/licenses/by/4.0
Mechanical properties of water hyacinth (Eichhornia crassipes) and sansevieria (Sansevieria trifasciata) fiber reinforced composite with polyester matric
Sansevieria (Sansevieria trifasciata) fibers and water hyacinth (Eichhornia Crassipes) fibers as natural fiber producers with good quality have good potential to be developed. This study aims to examine the production and characteristics of composites made from sansevieria fiber and water hyacinth fiber with a polyester matrix through the employment of the hand lay up method. This composite uses variations in the composition of the fiber mixture by soaking 5% NaOH for 2 hours at room temperature, for the resulting composite material. The resulting composite material is then subjected to a bending test to determine its mechanical properties, utilizing the ASTM D638 test standard. Based on the conducted research, the most favorable outcomes in terms of bending test results and modulus of elasticity are observed with a 10% incorporation of sansevieria fiber, yielding an average of 5.520 MPa for bending test and an elastic modulus of 7.444 MPa. Alternatively, when combining both fibers, the optimal mixture consists of 20% sansevieria fiber and 20% eceng gondok fiber, resulting in an average bending test value of 7.503 MPa and a modulus of elasticity of 7.873 MPa.
Copyright (c) 2024 Nurfajriani Nurfajriani, Ahmad Nasir Pulungan, Ajat Sudrajat, MS Manurung, Rahayu Rahayu https://creativecommons.org/licenses/by/4.0
Enhancing creativity skills and student learning outcomes through the implementation of creative problem solving model with mind mapping on salt hydrolysis topic
In the face of increasing demands for 21st-century skills, chemistry education must advance to better support students in developing problem-solving abilities. Effective chemistry learning models are crucial in addressing this need. This study examines the impact of the Creative Problem Solving (CPS) model, equipped with the Mind Mapping method, on students' creative thinking skills and cognitive learning outcomes in salt hydrolysis. A quasi-experimental method with a pretest-posttest control group design was used in this research. Cluster random sampling was employed for sample selection. The sample consisted of 72 students from a school in Surakarta City. Data were collected using a test instrument with eight essay questions to assess creative thinking skills and six essay questions to evaluate cognitive learning outcomes. Non-parametric statistical tests were utilized for data analysis. The results of the Kruskal-Wallis™s test produce sig. (0.000 < 0.05) which means the hypothesis is accepted. The results showed that applying the CPS learning model with mind mapping affected students' creative thinking skills and cognitive learning outcomes so that it can be used as an alternative learning model to improve 21st-century skills. This research contributes new insights into applying the Mind Mapping-assisted CPS learning model for chemistry education.
Copyright (c) 2024 Ari Syahidul Shidiq https://creativecommons.org/licenses/by/4.0
Development of an augmented reality-based chemical bonding module assisted by the assemblr EDU
Conventional media, like textbooks, lack interaction explaining chemical bonding, hindering dynamic learning. They're static and unable to visualize bonding effectively. Moreover, unengaging teaching methods cause student disinterest, hindering learning, particularly in complex subjects like chemical bonding. To address this issue, developing augmented reality-based chemical bonding modules is a potential solution to help students learn about chemical bonding. This study aims to accomplish the following objectives: (1) Develop a chemical bonding module based on augmented reality using the Assemblr EDU, following the ADDIE development model. (2) Determine the feasibility of the augmented reality-based chemical bonding module. The research methodology employed in this study is Research and Development (R&D), utilizing the ADDIE development model. The study's findings reveal the following: (1) The module was developed using the ADDIE development model with the Assemblr EDU. (2) The augmented reality-based chemical bonding module is highly valid, achieving a material validity score of 89.33% and a media validity score of 93.5%. It is also convenient, earning an average practicality rating of 88.14% with an "excellent" response from users. Additionally, the module is effective, as evidenced by a student evaluation score averaging 70, which falls within the high criteria range. The augmented reality-based module is a valuable tool for enhancing the understanding of chemical bonding during learning.
Copyright (c) 2024 Fransisca Ditawati Nur Pamenang, Agnesia Nina Utami https://creativecommons.org/licenses/by/4.0
The effect of pH and type of silicone on cotton and polyester finished fabrics
A Characteristic often found in textile products is softness. The compound widely used as softener is silicone compound. The aim of this research is to determine the properties that will be obtained from the type of fabric being processed by comparing the use of silicon types, namely amino-propyl-functional polydimethyl siloxane (PDMS) and blocked amino silicone to each fabric. Firstly, research was conducted by varying the pH of the finishing process. Determined optimum pH will be followed by determining concentration of 15“60 g/L for each type silicone. The experiments was carried out on pad- dry- cure method. The tests carried out include fabric stiffness, tensile strength, resistance to repeated washing and heat, yellowing effect, Fabric Touch Tester and Water Contact Angle testing. It was found that there was no significant influence of pH on the use of amino-propyl-functional polydimethyl siloxane and blocked amino silicone compounds, so the next process was carried out at pH 7. Increasing the concentration of the softener will provide a better softening effect and optimum concentration at 45 g/L for both types of fabric used. Blocked amino silicone has better resistance to repeated washing compared to amino-propyl-functional polydimethyl siloxane. Heat testing shows that differences in molecular structure have no influence on both fabrics. Fabric processed using amino-propyl-functional polydimethyl siloxane provides a yellowing effect. Amino-propyl-functional polydimethyl siloxane provides good hydrophilicity. The softness value of blocked amino silicone is better performance on cotton fabric.
Copyright (c) 2024 Wulan Safrihatini Atikah https://creativecommons.org/licenses/by/4.0
Measuring meaningful learning through the experience of chemistry education students' in the basics of analytical chemistry practicum
Chemistry Education students often engage in laboratory practicums to develop scientific process skills and enhance the meaning of chemistry learning, as seen in the course basic analytical chemistry. Previous research indicates that the basics of analytical chemistry practicum frequently focus solely on confirming basic knowledge, thus only leading to an improvement in basic experimental skills. This study aims to measure the level of meaningful learning achieved through the experiences of chemistry education students in in the basics of analytical chemistry practicum as evidence to improve the practicum curriculum in order to create more meaningful learning. The research method involves both quantitative and qualitative descriptive approaches, with quantitative data collected using the Meaningful Learning in the Laboratory Instrument (MLLI), which has been modified to measure students' affective and cognitive experiences after learning in the chemistry laboratory. The study involved 60 third semester students who had completed the basics of analytical chemistry practicum course. The results indicate that all aspects were rated as good, with percentage scores of 67% for affective aspects, 74% for cognitive aspects, and 69% for affective-cognitive aspects, yielding an overall average percentage score of 70%. These findings suggest that chemistry education students have achieved significant meaningful learning through their experiences in the basics of analytical chemistry practicum.
Copyright (c) 2024 Melur Regista Cahyani, Erlina Erlina, Ira Lestari, Masriani Masriani, Maria Ulfah https://creativecommons.org/licenses/by/4.0
Development of e-module based on Premna serratifolia research to identify functional group of secondary metabolites
The absence of self-learning resources tailored to the characteristics of students to study the identification of secondary metabolite functional groups based on research on medicinal plants in West Kalimantan necessitates the development of an e-module. This research aimed to develop an e-module based on Premna serratifolia research to identify functional groups in the Natural Products Chemistry course, ensuring its validity and practicality. The ADDIE model was followed, which included analysis, design, development, implementation, and evaluation stages, to develop this e-module. Data were collected using an indirect communication technique by distributing questionnaires. The research sample comprised 30 participants from Universitas Muhammadiyah Pontianak, Universitas Tanjungpura University, and Akademi Farmasi Yarsi Pontianak. The e-module was validated by nine validators, including subject matter experts, media experts, and language experts, with a validity score of 89.3%, indicating it is highly valid. The module was also found to be highly practical through individual, small-group, and large-group testing, with scores of 95.6%, 94.3%, and 98.3%, respectively. This research-based e-module is considered highly suitable and practical as a learning resource for identifying functional groups.
Copyright (c) 2024 Arni arni, Dini Hadiarti, Tuti Kurniati https://creativecommons.org/licenses/by/4.0